I'll give you a little warning on some of these courses, being a person with substantial knowledge of investments there are many of these courses which do not give due weight to the risks involved with many trading strategies.
A good thing to remember is risk-return parity, high returns = high risks and anyone who preaches differently is a liar, as arbitrage is virtually non existant for non-institutional traders.

ok, in short, say BHP is $39. The call barrier warrant may have a barrier at $37 and be priced at $2.20 . if BHP goes from $39 to $39.50, the barrier warrant will move from $2.20 to $2.70 ie. 1c for 1c movement. however if BHP goes from $39 to $38.50 the warrant will move from $2.20 to $1.70 . if BHP continues to fall through $37 (strike price), the barrier warrant will expire worthless.